Koyo
- 5591 Koyo
- Aichi Prefecture
- Asakura, Fukuoka
- Fukuoka Prefecture
- Fukushima Prefecture
- Hankyu Railway
- Hankyū Kōyō Line
- Hyōgo Prefecture
- Iwaki, Fukushima
- KOYO-LP
- Kesennuma
- Koyo (band)
- Koyo Electronics Corporation Limited
- Koyo Gakuin High School
- Koyo Seiko
- Koyo Zom
- Koyo language (disambiguation)
- Kyoto
- Kōyō
- Kōyō Gunkan
- Kōyōen Station
- Miyagi Prefecture
- Mukō
- Nagasaki Prefecture
- Nagoya
- Okayama
- Okayama Prefecture
- Okinawa Prefecture
- Wakayama (city)
- Wakayama Prefecture
- Yaese, Okinawa
- Ōmura, Nagasaki